Building permits, zoning and land rules in Dallas County, Texas

DUAS requires a county development permit for residential or nonresidential construction, installation, grading, filling and other development in unincorporated Dallas County¹. A new home or an addition of at least 500 square feet outside a municipality’s extra-territorial jurisdiction (ETJ) is subject to Dallas County’s residential building-code materials; the county also identifies residential inspections in its review process^2,13. The published residential building-permit fee is $100; development and other applicable fees are separate¹⁴.

Inside city limits, building permits come from Grand Prairie⁵, Rowlett¹⁵, Cedar Hill¹⁶, Coppell¹⁷, Duncanville¹⁸, Balch Springs¹⁹, and Addison³. Dallas County Health and Human Services handles septic permits outside cities; Grand Prairie and Cedar Hill have city septic programs^2,5,6.

The Dallas County Department of Unincorporated Area Services (DUAS) handles development and residential building permits for unincorporated property^1,14. DUAS is at Records Building - 500 Elm Street, Suite 6100, Dallas, TX 75202; call (214) 653-6565 or email development@dallascounty.org¹. Apply through MGO Connect with the applicable forms, authorization, fees, plat, deed, scope of work, site plan and survey^1,7. For property inside city limits, contact the municipality for building-permit requirements⁷.

Dallas County has no authority to enact county zoning². In unincorporated Dallas County, county zoning sets no minimum dwelling size, minimum lot size, setbacks, lot coverage or building-height limit, and does not prohibit RV, tiny-home or manufactured-home occupancy⁹. Development, floodplain, subdivision and septic requirements still apply^1,2.

Municipal zoning applies inside Grand Prairie²⁰, Mesquite²¹, Richardson²², Cedar Hill²³, Coppell²⁴, Farmers Branch²⁵, Balch Springs²⁶, Glenn Heights²⁷, and Addison⁴. Lewisville, primarily in Denton County but reaching into Dallas County, also sets its own zoning²⁸. Dallas County Health and Human Services remains the septic contact outside cities; Grand Prairie and Cedar Hill administer city septic programs^2,5,6.

An on-site sewage facility (OSSF), or septic system, requires a permit in unincorporated Dallas County; contact Dallas County Health and Human Services at (214) 819-2115^1,2. Inside Grand Prairie, the city’s Environmental Quality Division handles OSSF permits; inside Cedar Hill, the city’s Environmental Services Designated Representative reviews applications, authorizes construction and inspects systems^5,6.

Texas generally requires an approved plan and OSSF permit⁸. The narrow state exemption requires a single-family dwelling on at least 10 acres, a licensed site evaluation, compliance with state planning and construction standards, all system parts at least 100 feet from property lines, on-site disposal, no nuisance or groundwater pollution, and no other dwelling on the tract; confirm local requirements before relying on it⁸. Only 4.1% of Dallas County soils are rated “not limited” for conventional septic drain fields; septic is not necessarily impossible, but budget for a site evaluation and possibly an engineered system²⁹.

DUAS requires a placement permit before putting a mobile home or recreational vehicle on unincorporated Dallas County property⁷. A tiny home built as a new residence outside a city’s ETJ may enter the county residential-code and inspection process^2,13. Floodplain development needs a county floodplain permit, and septic systems need OSSF approval unless an exemption applies^1,8,11. Describe the unit, foundation, utilities and intended occupancy to DUAS before buying, and ask Health and Human Services about wastewater disposal.

1. Confirm city-limit and ETJ status with DUAS; county development applications apply only to unincorporated property, and the residential-code guidance distinguishes land outside a city’s ETJ^2,7.

1. Resolve required subdivision platting before development or OSSF permits, and obtain floodplain approval where required^10,11.

1. Arrange septic approval with Dallas County Health and Human Services unless every applicable exemption condition is satisfied^1,2,8.

1. Submit development and residential building applications through DUAS’s online system with the required supporting materials, then complete applicable residential inspections^7,13,14.

1. Obtain a county-road driveway or culvert permit where applicable, a meter release for electric or gas service, and a county right-of-way utility permit when needed⁷.

Check floodplain status before buying: Dallas County says most unincorporated land is considered floodplain, and covered development requires county approval¹¹. Confirm legal access and utility routing: work on a driveway or culvert connected to a county road needs a permit, electric or gas service changes need a meter release, and utility work in a county right-of-way needs a permit⁷. Dividing an unincorporated tract into at least 2 parts to lay out a subdivision requires preliminary and final plats before development or OSSF permits¹⁰. The effective property-tax rate is about 1.7%, with a median annual bill of about $4,668²⁹.